剑桥雅思ocean research雅思听力原文及答案

剑桥雅思ocean research雅思听力原文及答案

原文

SIMON:Thanks to all of you for coming along today to hear about how the robotic float project is helping with ocean research.Well,first of all,we’ll look at what a robotic float does and its use.So let’s start with the device itself.It looks a bit like a cigar and it’s about one and a half meters long.More importantly,it’s full of equipment that’s designed to collect data.So,it can help us in building up a profile of different factors which work together within the world’s oceans.Q21

STUDENT I:Sounds like a big project–isn’t it too big for one country to undertake?

SIMON:That’s quite true but this project is a really good example of international co-operation.Over the last five years scientists from thirteen countries have been taking part in the project and launching floats in their area of ocean control.And next year this number will rise to fourteen when Indonesia joins the project.Q22

STUDENT 2:That’s impressive.

SIMON:But let’s move onto how floats work.

SIMON:The operational cycle goes like this.Each of the floats is dropped in the ocean from a boat at a set point and activated from a satellite.Then the float immediately sinks about 2,000 meters…that’s two whole kilometers down in the water.It stays at this depth for about 10days and is carried around by the currents which operate in the ocean at this level.During this time it’s possible for it to cover quite large distances but the average is fifty kilometers.Q23 Q24

STUDENT 2:So what is it actually recording?

SIMON:Well at this stage nothing,but as it rises to the surface it collects all sorts of data,most importantly variations in salinity,that’s salt levels,and the changes in temperature,a bit like underwater weather balloons.Then when it gets back to the surface all the data it’s collected is beamed up to the satellite.After about five hours on the surface,the float automatically sinks,beginning the whole process again.Q25

STUDENT I:What happens to the data?

SIMON:Well the information is transferred direct to onshore meteorological stations…like our one in Hobart…and within four hours the findings can be on computers and they can be mapped and analysed.

STUDENT 2:You say you’re building models of the world’s ocean systems but how’re they going to be used,and more importantly,when?

SIMON:Some of the data has already helped in completing projects.For example,our understanding of the underlying causes of El Niño events is being confirmed by float data.Another way we’re using float data is to help us to understand the mechanics of climate change,like global warming and ozone depletion.That’s part of an ongoing variability study but the results are still a long way off.Q26 Q27

However,this is not the case with our ocean weather forecasting.Because we know from the floats what the prevailing weather conditions will be in certain parts of the ocean,we can advise the navy on search and rescue missions.That’s happening right now and many yachtsmen owe their lives to the success of this project.In addition,the float data can help us to look at the biological implications of ocean processes.Q28

STUDENT 1:Would that help with preserving fish stocks?Q29

SIMON:Yes,and advising governments on fisheries legislation.We’re well on the way to completing a project on this.We hope it will help to bring about more sustainable fishing practices.We’ll be seeing the results of that quite soon.

STUDENT 2:It sounds like the data from floats has lots of applications.

SIMON:Yes it does.It’s also a powerful agricultural tool.If we were aware of what the weather would be like,say,next year,we could make sure that the farmers planted appropriate grain varieties to produce the best yield from the available rainfall.STUDENT I:That sounds a bit like science fiction,especially when now we can’t even tell them when a drought will break.

SIMON:I agree that this concept is still a long way in the future,but it will come eventually and the float data will have made a contribution.Q30

答案

21.cigar

22.13 countries

23.activated

24.50 kilometers

25.temperature

26.A

27.C

28.A

29.B

30.C

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